[填空题]Burger King’s succeeded in using the power of repetition in their advertising.

[填空题]Burger King’s succeeded in using the power of repetition in their advertising.

[单项选择]The price of electricity produced using wind power is A. lower than the price of electricity produced using coal. B. expected to fall below that of electricity produced using coal. C. expected to fall to a level closer to that of electricity produced using coal.

[填空题]Swedish people voted to stop using nuclear power.

[单项选择]
Using the power of the sun is nothing new. People have had solar-powered calculators and buildings with solar panels for decades. But plants are the real experts: They’ve been using sunlight as an energy source for billions of years.
Ceils in the green leaves of plants work like tiny factories to convert sunlight, carbon dioxide, and water into sugars and starches, stored energy that the plants can use. This conversion process is called photosynthesis. Unfortunately, unless you’re a plant, it’s difficult and expensive to convert sunlight into storable energy. That’s why scientists are taking a closer look at exactly how plants do it.
Some scientists are trying to get plants, or biological cells that act like plants, to work as miniature photosynthetic power stations. For example, Mafia Ghirardi of the National Renewable Energy Laboratory in Golden, Colo., is working with green algae. She’s trying to trick
A. Plants are the real experts in producing solar energy.
B. Plants have been used to produce solar energy.
C. Plants have been using solar energy for billions of years.
D. Plants have been a source of solar energy.

[单项选择]第二篇Putting Plants to Work Using the power of the sun is nothing new. People have had solar-powered calculators and buildings with solar panels for decades. But plants are the real experts: They’ve been using sunlight as an energy source for billions of years. Cells in the green leaves of plants work like tiny factories to convert sunlight, carbon dioxide, and water into sugars and starches, stored energy that the plants can use. This conversion process is called photosynthesis. Unfortunately, unless you’re a plant, it’s difficult and expensive to convert sunlight into storable energy. That’s why scientists are taking a closer look at exactly how plants do it. Some scientists are trying to get plants, or biological cells that act like plants, to work as miniature photosynthetic power stations. For example, Maria Ghirardi of the National Renewable Energy Laboratory in Golden, Colo., is working with green algae. She’s trying to trick them into producing hydrogen instead of sugars when
A. They grow faster in a reactor.
B. They will be planted everywhere.
C. They are cheap to eat.
D. They can be a good energy source.

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Using enzymes commonly found in living cells, a new type of fuel cell produces small amounts of electricity from sugar. If the technology is able to succeed in mass production, you may some day share your sweet drinks with your cell phone.
In fuel cells, chemical reactions generate electrical currents. The process usually relies on precious metals, such as platinum. In living cells, enzymes perform a similar job, breaking down sugars to obtain electrons and produce energy.
When researchers previously used enzymes in fuel cells, they had trouble keeping them active, says Shelley D. Minteer of St Louis University. Whereas biological cells continually produce fresh enzymes, there’s no mechanism in fuel cells to replace enzymes as they quickly degrade.
Minteer and Tamara Klotzbach, also of St Louis University, have now developed polymers that wrap around an enzyme and preserve it in a microscopic poc
A. When enzymes can be commonly found in living cells.
B. When the technology of producing a new type of fuel cell appears.
C. When the technology of a new type of fuel cell is suitable for mass production.
D. When the technology of mass producing cell phones appears.